Universal seed metering disc

ABSTRACT

The present invention is a seed metering disc for the distribution and planting of various sizes of seeds. The seed metering disc is defined by a set of seed cells which can accommodate various seed sizes in that each cell is defined by a recess, seed cell retention wall, and seed cell retention plate.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to U.S. Provisional Application No.60/232,735, filed on Sep. 15, 2000, the entire disclosure of which isincorporated herein by reference.

FIELD OF THE INVENTION

The present invention is directed to a universal seed metering disc. Inparticular, it relates to a seed metering disc with a seed retentionplate defining a seed cell. It finds particular application in use withvarying sizes of seeds.

BACKGROUND

In many agricultural areas, large planters equipped with numerous rowunits are used to plant crop fields. The row units follow the planterand discharge seeds into the soil at a selected rate. In order to createuniformity and proper crop distance, seed meters are attached to the rowunits. Large seed reservoirs store the seeds as the planters move acrossthe crop fields. Seeds are released from the seed reservoirs and areevenly dispersed between the row units. The seeds travel down the rowunit and are discharged onto a rotating seed disc wherein the seedsgravitate into a series of specially-molded seed pockets, spaced toprovide adequate crop distance. The seeds are retained in the seedpockets and then individually enter seed cells located at the peripheryof the seed discs. The seed cells are typically sized to retain a singleseed of a particular size and deliver it to the soil at a fixed point inthe rotation of the seed disc. See, e.g., U.S. Pat. No. 5,058,766assigned to Kinze Mfg. Due to the design of the seed cells, seedmetering discs will only distribute seeds properly if the seeds are ofthe size the seed discs are designed to handle. Therefore, when plantingmore than one type of crop, and thus using different seed sizes, morethan one set of seed metering discs must be purchased and installed toallow for proper seed metering. While the large size seed metering discscan be used for smaller seeds, the design of the seed cells for largediscs does not allow for proper delivery of small seeds to the soil.Instead of falling at the designated seed delivery point, the smallerseeds slip from the seed cells at various points during seed discrotation and are thus delivered in a non-uniform pattern. Typically, thesmaller seeds fall out the backside of the seed cell and therefore fallto the soil outside the designated crop row.

SUMMARY OF INVENTION

The present invention relates to a seed metering device and moreparticularly to an improved universal seed metering device which permitsthe planter to use one set of seed metering discs to properly deliverseeds of varying sizes to the designated crop rows. It provides a seedretention plate located on the backside of a seed metering disc forreducing seed loss through the backside of a seed cell, thereby allowingsmaller seeds to be properly dispersed using larger seed metering discs.

An advantage of the present invention is that seeds of varying sizes maybe planted by one metering disc or one set of metering discs. Stillfurther advantages of the present invention will become apparent tothose of ordinary skill in the art upon reading and understanding thefollowing detailed description of embodiments of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

In the accompanying drawings which are incorporated in and constitute apart of the specification, embodiments of the invention are illustrated,which, together with a general description of the invention given above,and the detailed description given below, serve to exemplify theprinciples of the invention.

FIG. 1 is a front view of an improved universal seed metering disc; and

FIG. 2 is a cross-sectional view of the disc of FIG. 1.

DETAILED DESCRIPTION

The present invention is an improved seed metering disc for a seedplanter which provides for universal seed use. Referring to FIG. 1 andFIG. 2, an exemplary improved universal seed metering disc 10 comprisesa seed disc 20 and a seed retention plate 30. Seed disc 20 has a frontside 41 and a backside 42, wherein the front side has a plurality ofgrooved seed pockets 50 and seed cells 55. The seed pockets 50 aregenerally radially situated around the front side 42 of the seed disc20. Each of the seed pockets 50 comprise a channel which leads directlyinto a seed cell 55. Each channel may be round and smooth to facilitateseed movement within the seed pockets 50. Each seed cell 55 has a recess66, a seed delivery opening 67 and seed cell retention walls 68. Eachseed cell 55 is further defined by seed retention plate 30 affixed tothe seed disc 20 such as to form a backside of each seed cell 55 wherethe recess 66 ends at break 69.

Seed retention plate 30 is substantially similar in shape and diameteras the seed disc 20 and is made from any suitable material, including aweather-safe durable material, such as a coated aluminum. The seedretention plate 30 can be affixed to the seed disc 20 by any appropriatefastening means, including a set of one or more fastening bolts 70 thatpass through the front side 41 of the seed disc 20 and through the seedretention plate 30 where the bolts can be secured by one or more lockingnuts. The locking nuts should be fastened tightly such as to providecontact or near contact between the seed disc 20 and the seed retentionplate 30, wherein the distance between seed disc 20 and seed retentionplate 30 is small enough to prohibit seeds from sliding between the seeddisc 20 and the seed retention plate 30.

In one embodiment, as shown in FIG. 2, a gasket 80, comprised of eithersponge, foam, or other suitable material, is placed between the seeddisc 20 and the seed retention plate 30. The gasket assists in holdingthe seeds in the seed cells 55 by increasing the friction force whichthe seed must overcome in order to slide from the seed cell 55. Thegasket 80 further provides a means for ensuring contact or near contactbetween the seed disc 20 and the seed retention plate 30, and fills anyspace therebetween.

Seeds stored in a seed reservoir of a planter are dropped onto the seeddisc 20 which is at rotating in a vertical plane along a shaft whichcontacts and retains the seed metering disc 10 through the shaft hole85. In an embodiment, more than one seed metering discs 10 are used bydividing the planter into a set number of row units, connecting one seedmetering disc 10 per row unit, and evenly delivering seeds from the seedreservoir to each of the row units.

The seed disc 20 rotates at a set speed creating a centrifugal forcewhich, along with a brush system as described in U.S. Pat. No.5,058,766, forces the seeds into the seed pockets 50. The rotationalforce pushes the seeds along the channel of the seed pockets 50 untilthe seeds reach the seed cells 55. The seeds then fall individually, orin small seed packets, into the recess 66 of seed cells 55 and areretained within the seed cells 55 by the seed retention walls 68 and theseed retention plate 30. Smaller seeds that would otherwise slide outbreak 69 and out the backside 42 in the recess 66 of the seed cell 55are held in place by the seed retention plate 30. When the seed meteringdisc 10 reaches a fixed point in its rotation, the seeds are thrust fromthe seed cells 55 out the seed delivery opening 67 and into thecorresponding crop row.

While the present invention has been illustrated by the description ofembodiments thereof, and while the embodiments have been described indetail, it is not the intention of the applicant to restrict or in anyway limit the scope of the appended claims to such detail. Additionaladvantages and modifications will readily appear to those skilled in theart. Therefore, the invention, in its broader aspects, is not limited tothe specific details and illustrative examples shown and described.Accordingly, departures may be made from such details without departingfrom the spirit or scope of the applicant's general inventive concept.

I claim:
 1. An improved seed metering disc having a seed disc, whereinsaid seed disc includes a front side and a backside; the front side ofsaid seed disc has at least one groove leading generally radially to aseed cell positioned on the periphery of said seed disc, wherein saidseed cell has a recess with raised edges to hold a seed or seed packet,wherein said improvement comprises: a seed retention plate affixed tothe backside of said seed disc; and a gasket placed between the seeddisc and the seed retention plate.
 2. The seed metering disc of claim 1wherein the retention plate has substantially the same diameter as theseed disc.
 3. The seed metering disc of claim 1, wherein said seedretention plate is coated aluminum.
 4. The seed metering disc of claim1, wherein said seed retention plate is affixed to said seed disc by oneor more fastening bolts.
 5. The seed metering disc of claim 4, whereinsaid gasket is sponge or foam.
 6. The seed metering disc of claim 1,wherein said seed retention plate is affixed to said seed disc such thatthe distance between the seed retention plate and the seed disc is lessthan the size of a seed.
 7. The seed metering disc of claim 1, whereinsaid gasket is sponge or foam.
 8. The seed metering disc of claim 4,wherein said gasket is sponge or foam.
 9. A seed metering disc formetering seeds of varying sizes, comprising: a seed retention platehaving a front side; a seed disc having a front side, a backside, atleast one grooved seed pocket on the front side extending generallyradially towards the periphery of the seed disc and defining at leastone seed cell retention wall at an end of the seed pocket, and at leastone seed cell defined by at least one seed cell retention wall and thefront side of the seed retention plate; and a gasket placed between theseed disc and the seed retention plate; wherein the front side of theretention plate abuts the backside of the seed disc.
 10. The seedmetering disc of claim 9, wherein the retention plate and seed disc aregenerally circular and of substantially similar diameter.
 11. The seedmetering disc of claim 9, wherein said seed retention plate is coatedaluminum.